- A
Use S3 Access Points with a policy that restricts access to only Lake Formation
Why wrong: Access Points can restrict access, but Lake Formation still requires appropriate IAM permissions; this does not fully enforce the requirement.
- B
Grant the user permissions only through Lake Formation and remove any IAM policies that allow direct S3 access to the data location
This ensures that the user can only access data through Lake Formation, and direct S3 access is blocked.
- C
Enable S3 Block Public Access on the bucket
Why wrong: Block Public Access prevents public access but does not prevent authenticated users with IAM permissions from accessing S3 directly.
- D
Change the S3 bucket policy to deny all access except from Lake Formation
Why wrong: Lake Formation does not have a specific principal; it uses IAM roles. This approach is not straightforward and may not work as expected.
Quick Answer
The correct answer is to grant the user permissions only through Lake Formation and remove any IAM policies that allow direct S3 access to the data location. This works because when you register an S3 location with Lake Formation and enable the “Lake Formation managed” option, the service becomes the sole authority for access control, overriding any direct S3 bucket policies or IAM permissions. On the AWS Certified Data Engineer Associate DEA-C01 exam, this scenario tests your understanding of how Lake Formation permission management enforces a security boundary—a common trap is assuming that granting SELECT on a table automatically blocks S3 access, but without revoking IAM policies, users can still query the underlying data directly. The key insight is that Lake Formation acts as a centralized permission layer, and for it to be effective, you must remove all other paths to the data. Memory tip: think of Lake Formation as the only door to the data lake—if you leave the S3 window open, users will climb through it.
DEA-C01 Data Security and Governance Practice Question
This DEA-C01 practice question tests your understanding of data security and governance. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company uses AWS Lake Formation to manage data lake permissions. The data engineer notices that a user with SELECT permission on a table can also query the underlying data in Amazon S3 directly. How can the engineer enforce that access to the S3 data is only through Lake Formation?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Grant the user permissions only through Lake Formation and remove any IAM policies that allow direct S3 access to the data location
Registering the S3 location with Lake Formation and using the 'Lake Formation managed' option ensures that IAM policies do not grant direct S3 access. Lake Formation provides fine-grained access control, and by granting only Lake Formation permissions and revoking direct S3 bucket permissions, users cannot bypass Lake Formation. Option B and D do not prevent direct S3 access. Option C suggests Lake Formation does not control S3 access, which is incorrect.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use S3 Access Points with a policy that restricts access to only Lake Formation
Why it's wrong here
Access Points can restrict access, but Lake Formation still requires appropriate IAM permissions; this does not fully enforce the requirement.
- ✓
Grant the user permissions only through Lake Formation and remove any IAM policies that allow direct S3 access to the data location
Why this is correct
This ensures that the user can only access data through Lake Formation, and direct S3 access is blocked.
Related concept
Standard ACLs match source addresses.
- ✗
Enable S3 Block Public Access on the bucket
Why it's wrong here
Block Public Access prevents public access but does not prevent authenticated users with IAM permissions from accessing S3 directly.
- ✗
Change the S3 bucket policy to deny all access except from Lake Formation
Why it's wrong here
Lake Formation does not have a specific principal; it uses IAM roles. This approach is not straightforward and may not work as expected.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
- Standard ACLs match source addresses.
- Extended ACLs can match source, destination, protocol and ports.
- The first matching ACL entry is used.
- There is usually an implicit deny at the end.
TExam Day Tips
- Check inbound versus outbound direction.
- Read the ACL from top to bottom.
- Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related DEA-C01 ACL questions on filtering logic and placement.
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Data Security and Governance — study guide chapter
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FAQ
Questions learners often ask
What does this DEA-C01 question test?
Data Security and Governance — This question tests Data Security and Governance — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Grant the user permissions only through Lake Formation and remove any IAM policies that allow direct S3 access to the data location — Registering the S3 location with Lake Formation and using the 'Lake Formation managed' option ensures that IAM policies do not grant direct S3 access. Lake Formation provides fine-grained access control, and by granting only Lake Formation permissions and revoking direct S3 bucket permissions, users cannot bypass Lake Formation. Option B and D do not prevent direct S3 access. Option C suggests Lake Formation does not control S3 access, which is incorrect.
What should I do if I get this DEA-C01 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related DEA-C01 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
About these practice questions
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Same concept, more angles
2 more ways this is tested on DEA-C01
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company is using AWS Lake Formation to manage permissions on a data lake. They want to grant a data scientist the ability to query tables in the 'analytics' database using Amazon Athena, but prevent them from accessing the underlying S3 data directly. What is the best way to achieve this?
easy- A.Grant the data scientist an IAM policy with s3:GetObject on the S3 bucket.
- ✓ B.Grant SELECT permission on the 'analytics' database tables in Lake Formation.
- C.Create an IAM policy that allows Athena queries only.
- D.Add the data scientist to a Lake Formation data lake location with read access.
Why B: Option A is correct because Lake Formation can grant SELECT permission on tables, and with Lake Formation metadata filtering, the user can query via Athena without direct S3 access. Option B is incorrect because granting s3:GetObject on the entire bucket would allow direct access. Option C is incorrect because they need access to the database objects, not just the database. Option D is incorrect because IAM policies for Athena do not restrict S3 access.
Variation 2. A company is using AWS Lake Formation to manage permissions on a data lake. Which of the following are valid ways to grant access to a user or role? (Choose THREE.)
medium- ✓ A.Grant permissions to a SAML or SCIM group
- ✓ B.Grant permissions using tag-based access control (LF-Tags)
- ✓ C.Grant permissions to an IAM user or role
- D.Grant permissions to an AWS Organizations unit
- E.Grant permissions via an S3 bucket policy
Why A: Options A, B, and E are correct. Lake Formation can grant directly to IAM users/roles, to SAML/SCIM groups, and through tag-based access control. Option C is wrong because AWS Organizations is for account management, not individual permissions. Option D is wrong because S3 bucket policies are separate from Lake Formation.
Last reviewed: Jun 20, 2026
This DEA-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DEA-C01 exam.
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